Fix bugs of a11y tree when the tag is empty

desktop_env/evaluators/getters/__init__.py

@@ -7,3 +7,4 @@ from .misc import get_rule, get_accessibility_tree
 from .replay import get_replay
 from .vlc import get_vlc_playing_info, get_vlc_config
 from .vscode import get_vscode_config
+from .impress import get_audio_in_slide